Amy is very excited for the day of her wedding. on that day she experiences a spike in happiness and this feeling lasts for about a month. then, she returns to her "normal" levels of mood. what is this an example of:
1) cyclical happiness
2) the "contrast effect"
3) the "marriage effect"
4) adaptation

Adaptation  

Explanation:

Adaptation is basically about to adapt self in the environment according to the need of a person. It is an ability to adapt self in a changing environment and experience. Learning is the best way to adapt self in a changing environment. Adaptation is phenomena through that we adopt our changing environment and that help us to cope up with changing environment. According to Jean Piaget, the adaptation occur in two ways:  

Thus the adaptation is a very crucial and very critical part of our cognitive development. Through these two processes called assimilation and accommodation, an individual learns to take new information and to adapt in a new environment.

well considering i can't see the graph, it's probably prices